30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // A Symbol is a canonicalized string.
35 // All Symbols reside in global symbolTable.
36
37 public class Symbol extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("Symbol");
48 length = type.getCIntegerField("_length");
49 baseOffset = type.getField("_body").getOffset();
50 idHash = type.getCIntegerField("_identity_hash");
51 }
52
53 // Format:
54 // [header]
55 // [klass ]
56 // [length] byte size of uft8 string
57 // ..body..
58
59 public static Symbol create(Address addr) {
60 if (addr == null) {
61 return null;
62 }
63 return new Symbol(addr);
64 }
65
66 Symbol(Address addr) {
67 super(addr);
68 }
69
70 public boolean isSymbol() { return true; }
71
72 private static long baseOffset; // tells where the array part starts
73
74 // Fields
75 private static CIntegerField length;
76
77 // Accessors for declared fields
78 public long getLength() { return length.getValue(this.addr); }
79
80 public byte getByteAt(long index) {
81 return addr.getJByteAt(baseOffset + index);
82 }
83
84 private static CIntegerField idHash;
85
86 public int identityHash() { return (int)idHash.getValue(this.addr); }
87
88 public boolean equals(byte[] modUTF8Chars) {
89 int l = (int) getLength();
90 if (l != modUTF8Chars.length) return false;
91 while (l-- > 0) {
92 if (modUTF8Chars[l] != getByteAt(l)) return false;
93 }
94 if (Assert.ASSERTS_ENABLED) {
95 Assert.that(l == -1, "we should be at the beginning");
96 }
97 return true;
98 }
99
100 public byte[] asByteArray() {
101 int length = (int) getLength();
102 byte [] result = new byte [length];
103 for (int index = 0; index < length; index++) {
104 result[index] = getByteAt(index);
105 }
106 return result;
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30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 // A Symbol is a canonicalized string.
35 // All Symbols reside in global symbolTable.
36
37 public class Symbol extends VMObject {
38 static {
39 VM.registerVMInitializedObserver(new Observer() {
40 public void update(Observable o, Object data) {
41 initialize(VM.getVM().getTypeDataBase());
42 }
43 });
44 }
45
46 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
47 Type type = db.lookupType("Symbol");
48 length = type.getCIntegerField("_length");
49 baseOffset = type.getField("_body").getOffset();
50 idHash = type.getJShortField("_identity_hash");
51 }
52
53 // Format:
54 // [header]
55 // [klass ]
56 // [length] byte size of uft8 string
57 // ..body..
58
59 public static Symbol create(Address addr) {
60 if (addr == null) {
61 return null;
62 }
63 return new Symbol(addr);
64 }
65
66 Symbol(Address addr) {
67 super(addr);
68 }
69
70 public boolean isSymbol() { return true; }
71
72 private static long baseOffset; // tells where the array part starts
73
74 // Fields
75 private static CIntegerField length;
76
77 // Accessors for declared fields
78 public long getLength() { return length.getValue(this.addr); }
79
80 public byte getByteAt(long index) {
81 return addr.getJByteAt(baseOffset + index);
82 }
83
84 private static JShortField idHash;
85
86 public short identityHash() { return (short)idHash.getValue(this.addr); }
87
88 public boolean equals(byte[] modUTF8Chars) {
89 int l = (int) getLength();
90 if (l != modUTF8Chars.length) return false;
91 while (l-- > 0) {
92 if (modUTF8Chars[l] != getByteAt(l)) return false;
93 }
94 if (Assert.ASSERTS_ENABLED) {
95 Assert.that(l == -1, "we should be at the beginning");
96 }
97 return true;
98 }
99
100 public byte[] asByteArray() {
101 int length = (int) getLength();
102 byte [] result = new byte [length];
103 for (int index = 0; index < length; index++) {
104 result[index] = getByteAt(index);
105 }
106 return result;
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